GUIs have keyboard shortcuts for decades, blame the developer that wasn't up to their stuff, not providing keyboard navigation.

Heck, there are even Win32 and X Windows APIs designed with the exact purpose for keyboard navigation and shortcuts.

Maybe instead of doing TUIs one should better spend their time learning the tools of their craft.

Skyscanner failure to adopt such tooling, which browser also have due to accessibility requirements, has nothing to do with technical issues, all about skill and willingness where to spend budget.